Abstract
In this chapter we introduce nonlinear scalarization methods that are very important from the theoretical as well as computational point of view. We introduce different scalarizing functionals and discuss their properties, especially monotonicity, continuity, Lipschitz continuity, sublinearity, convexity. Using these nonlinear functionals we show nonconvex separation theorems. These nonlinear functionals are used for deriving necessary optimality conditions for solutions of set-valued optimization problems in Sect. 12.8 and in different proofs, especially in the proof minimal point theorems in Chap. 10. Moreover, we study characterizations of solutions of set-valued optimization problems by means of nonlinear scalarizing functionals. Finally, we present the extremal principle by Kruger and Mordukhovich and discuss its relationship to separation properties of nonconvex sets. This extremal principle will be applied in Sect. 12.9 for deriving a subdifferential variational principle for set-valued mappings and in Sect. 12.11 in order to prove a first order necessary condition for fully localized minimizers of set-valued optimization problems.
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Khan, A.A., Tammer, C., Zălinescu, C. (2015). Nonconvex Separation Theorems. In: Set-valued Optimization. Vector Optimization. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54265-7_5
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